LNK2019: unresolved external symbol error in Visual Studio C++
First check How to build applications with OpenCV inside the Microsoft Visual Studio
If you still suffer from the same problem, you could be under one of the below cases.
- Your active solution platform is x86 but you are trying to link x64 OpenCV libraries.
- Your active solution platform is X64 but you are trying to link x86 OpenCV libraries.
If you are under one of these cases, check Compiling a 64-bit Application in Microsoft Visual Studio Express 2010
Add these into your code:
#pragma comment (lib, "opencv_core248d.lib")
#pragma comment (lib, "opencv_highgui248d.lib")
#pragma comment (lib, "opencv_imgproc248d.lib")
#pragma comment (lib, "opencv_video248d.lib")
#pragma comment (lib, "opencv_features2d248d.lib")
It worked for me.
'unresolved external symbol' means that you're not linking with required library.
Go to Properties -> Linker -> Additional Library dependencies and add path to OpenCV libs.